encodeFilterTopics does not support negative values

[ceyonur]

Ethers Version

6.8.1

Search Terms

abi, topics, int256

Describe the Problem

I added a Test interface with int256 indexed topic as follow:

            function encodeTopics(name, value) {
            	var iface = new ethers.Interface([
            		"event Test(int256 indexed test)"
            	]);
            	var filter = iface.encodeFilterTopics("Test", [ value ]);
            	return filter[1];
            }

and run it with encodeTopics("-1"), I got this:

 RangeError: unsigned value cannot be negative (fault="overflow", operation="getUint", value="-1", code=NUMERIC_FAULT, version=6.8.1)

This should be able to take negative integers, but toBeHex and getUint function does not allow negative values here. I was expecting -1 to be encoded successfully to (ffffffffff...ffff)

Code Snippet

function encodeTopics(value) {
            	var iface = new utils.Interface([
            		"event Test(int256 indexed test)"
            	]);
            	var filter = iface.encodeFilterTopics("Test", [ value ]);
            	return filter[1];
            }
            encodeTopics("-1")

### Contract ABI

_No response_

### Errors

```shell
RangeError: unsigned value cannot be negative (fault="overflow", operation="getUint", value="-1", code=NUMERIC_FAULT, version=6.8.1)

Environment

No response

Environment (Other)

No response